drivers: thermal: step_wise: add support for hysteresis #5936
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Step wise governor increases the mitigation level when the temperature goes above a threshold and will decrease the mitigation when the temperature falls below the threshold. If it were a case, where the temperature hovers around a threshold, the mitigation will be applied and removed at every iteration. This reaction to the temperature is inefficient for performance. The use of hysteresis temperature could avoid this ping-pong of mitigation by relaxing the mitigation to happen only when the temperature goes below this lower hysteresis value. Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org> Signed-off-by: Lina Iyer <ilina@codeaurora.org> drivers: thermal: step_wise: avoid throttling at hysteresis temperature after dropping below it Signed-off-by: Serge Schneider <serge@raspberrypi.com>
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See: raspberrypi/linux#5930 kernel: drm/vc4: Disable overrun interrupts See: raspberrypi/linux#5935 kernel: drivers: thermal: step_wise: add support for hysteresis See: raspberrypi/linux#5936 kernel: media: rp1: cfe: Actually use the number of lanes configured See: raspberrypi/linux#5941 kernel: PCI: brcmstb: Enable CRS software visibility after linkup See: raspberrypi/linux#5889 kernel: SDHCI vs EMMC on Pi 5 See: raspberrypi/linux#5937
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See: raspberrypi/linux#5930 kernel: drm/vc4: Disable overrun interrupts See: raspberrypi/linux#5935 kernel: drivers: thermal: step_wise: add support for hysteresis See: raspberrypi/linux#5936 kernel: media: rp1: cfe: Actually use the number of lanes configured See: raspberrypi/linux#5941 kernel: PCI: brcmstb: Enable CRS software visibility after linkup See: raspberrypi/linux#5889 kernel: SDHCI vs EMMC on Pi 5 See: raspberrypi/linux#5937
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This is a roll-up of the two previous hysteresis patches, but updated cleanly for the 6.6 kernel. Without this there is no hysteresis, leading to fans "pumping" at the threshold temperatures.